Katherine and James ran a small lakeside resort in Blissful Point, Massachusetts, during the hectic summer months, then endured the often-desolate winters in relative isolation. Their lives were happy until one morning when the body of a young boy was found floating in the lake. From that moment Katherine watched as her husband began to spiral into insanity. Then he vanished without a trace.

Now, months later, as a blizzard descends over Blissful Point, Katherine faces her final winter alone on the lake. But things are no longer what they seem. Is something out there, haunting the snowy woods, waiting in the lake, luring her toward the same madness that claimed James?